Is there something wrong with the Great Wall Fengjun 5 that can't shift into 4th gear and even

Hello darling! If there is nothing abnormal on the other gears, it means the shift fork is fine. Both the 1st gear synchronizer and the locking device may be defective, making it difficult to engage and disengage the gear! It is easy to repair, but the labor cost is very high. It is estimated to cost 500 yuan in labor time, because it is very difficult to disassemble and assemble the part, plus the cost of the parts! Hope this helps!